Com os avanços tecnológicos que subsidiam as novas formas de compreender a cognição e comunicação humana, destaca-se a internet que se configura no meio docente como suporte midiático aos processos interativos e de criação de identidade profissional. O diário de classe é uma ferramenta importante no processo educacional, porém abrange somente alguns aspectos do cotidiano docente, que pouco revelam acerca da identidade profissional do professor. Algumas instituições já adotaram o diário virtual, mas a formalidade somente mudou de ambiente, pois obedecem aos mesmos padrões de registros diários. Modernamente, surgiram os blogs, contendo, em sua essência, por meio da escrita, o caráter de colaboração, interação e divulgação dos conhecimentos docentes, indo além dos diários de classe. Diante disso, este estudo tem como objetivo analisar traços de identidade profissional de professores que elaboram blogs, tendo assim, caráter subjetivo e clarificador de seus conteúdos, a partir das vivências descritas nos auto-relatos diários. Justifica-se pelo seu teor revelador a respeito da imagem desgastada que tem o professor na atualidade, bem como pelo encontro do uso das tecnologias como ferramentas que auxiliam nos processos educacionais investigativos. Neste sentido, o trabalho contextualiza a utilização das tecnologias no meio educacional, apresentando as vantagens e desvantagens existentes neste processo e discutindo as relações que se estabelecem no trabalho docente a partir do uso destes recursos. Posteriormente, a ênfase é dada aos blogs, seu histórico e tipologia, apresentando a relação entre estes e a educação. São esboçados fundamentos sobre a constituição do sujeito, situando os blogs como meios para a escrita de si, analisando os significados e funções que estes vêm assumindo como dispositivos de criação de identidade profissional docente. Para tanto, são visitados autores como Foucault, Dubar e Melucci. A presente pesquisa é de caráter qualitativo e analisa conteúdos de cinco blogs de professores brasileiros no período de atualização de posts em 4 meses em 2008. Os resultados sinalizam, entre outros aspectos, que os diários virtuais revelam traços da identidade profissional de professores, uma vez que são presentes neste ambiente as subjetividades e os processos que permitem leituras das escritas de si, convergindo para a compreensão das perspectivas profissionais dos seus autores ; With technological advances that subsidize the new ways of understanding human cognition and communication, there is the Internet that is configured as a support teacher in the media to interactive processes and the establishment of professional identity. The day of class is an important tool in the educational process, but covers only some aspects of daily teaching, which reveal little about the professional identity of teachers. Some institutions have already adopted the virtual diary, but only the formality of the environment has changed since meeting the same standards of records daily. Modern, came the blogs, containing in its essence, through writing, the nature of collaboration, interaction and dissemination of knowledge teachers, beyond the day of class. Thus, this study aims to analyze traces of professional identity of teachers who produce blogs, thus, clarifying and subjective nature of its contents, from the experiences described in self-reported daily. Is justified by its content developer on the image that has eroded the teacher in the present and the meeting of the use of technology as tools that assist in educational research processes. In this sense, the work context of the use of technology in the educational environment, presenting the advantages and disadvantages in this process and discussing the relations established in teaching from the use of these resources. Subsequently, emphasis is given to the blogs, your history and typology, showing the relationship between them and education. Reasons are outlined on the constitution of the subject, placing the blogs as means for writing them, analyzing the meanings and functions they have assumed as devices for creating professional identity. Thus, authors are viewed as Foucault, Dubar and Melucci. This research is qualitative in nature and examines contents of five Brazilian blogs for teachers in the period of update of posts within 4 months in 2008. The results indicate, among other things, the daily online show traces of the professional identity of teachers, since they are present in this environment the subjectivities and processes that allow reading of the records themselves, converge to understanding the career prospects of their authors Minimize

One of the most challenging tasks for extreme ultraviolet, soft and hard x-ray free-electron laser photon diagnostics is the precise determination of the photon pulse duration, which is typically in the sub 100 fs range. Nine different methods, able to determine such ultrashort photon pulse durations, were compared experimentally at FLASH, the s...

One of the most challenging tasks for extreme ultraviolet, soft and hard x-ray free-electron laser photon diagnostics is the precise determination of the photon pulse duration, which is typically in the sub 100 fs range. Nine different methods, able to determine such ultrashort photon pulse durations, were compared experimentally at FLASH, the self-amplified spontaneous emission free-electron laser at DESY in Hamburg, in order to identify advantages and disadvantages of different methods. Radiation pulses at a wavelength of 13.5 and 24.0 nm together with the corresponding electron bunch duration were measured by indirect methods like analyzing spectral correlations, statistical fluctuations, and energy modulations of the electron bunch and also by direct methods like autocorrelation techniques, terahertz streaking, or reflectivity changes of solid state samples. In this paper, we present a comprehensive overview of the various techniques and a comparison of the individual experimental results. The information gained is of utmost importance for the future development of reliable pulse duration monitors indispensable for successful experiments with ultrashort extreme ultraviolet pulses. Minimize